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The “Complex Numbers” category gathers books that introduce and develop the arithmetic, geometry, and applications of numbers of the form a + bi, where i² = −1. Titles range from accessible primers on the complex plane, polar form, roots, and Euler’s formula to more advanced treatments that bridge into complex functions and the foundations of complex analysis. Readers will find problem-focused texts, visual guides, and computational approaches that show how complex numbers simplify rotations, oscillations, and wave phenomena, and how they power techniques in engineering (AC circuits, signal processing, control), physics, and applied mathematics. Many books also explore geometric interpretations (Argand diagrams, Möbius transformations), numerical methods, and connections to topics like differential equations and Fourier methods. Suitable for high school and undergraduate students, self-learners, and professionals seeking both theoretical insight and practical tools.

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